linux-kernel - [PATCH v12 24/29] HMM: allow to get pointer to spinlock protecting a directory.

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Message-Id: <1457469802-11850-25-git-send-email-jglisse@redhat.com>
Date:	Tue,  8 Mar 2016 15:43:17 -0500
From:	Jérôme Glisse <jglisse@...hat.com>
To:	akpm@...ux-foundation.org, <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>, <joro@...tes.org>,
	Mel Gorman <mgorman@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Dave Airlie <airlied@...hat.com>,
	Brendan Conoboy <blc@...hat.com>,
	Joe Donohue <jdonohue@...hat.com>,
	Christophe Harle <charle@...dia.com>,
	Duncan Poole <dpoole@...dia.com>,
	Sherry Cheung <SCheung@...dia.com>,
	Subhash Gutti <sgutti@...dia.com>,
	John Hubbard <jhubbard@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Lucien Dunning <ldunning@...dia.com>,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Arvind Gopalakrishnan <arvindg@...dia.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Liran Liss <liranl@...lanox.com>,
	Roland Dreier <roland@...estorage.com>,
	Ben Sander <ben.sander@....com>,
	Greg Stoner <Greg.Stoner@....com>,
	John Bridgman <John.Bridgman@....com>,
	Michael Mantor <Michael.Mantor@....com>,
	Paul Blinzer <Paul.Blinzer@....com>,
	Leonid Shamis <Leonid.Shamis@....com>,
	Laurent Morichetti <Laurent.Morichetti@....com>,
	Alexander Deucher <Alexander.Deucher@....com>,
	Jérôme Glisse <jglisse@...hat.com>
Subject: [PATCH v12 24/29] HMM: allow to get pointer to spinlock protecting a directory.

Several use case for getting pointer to spinlock protecting a directory.

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
---
 include/linux/hmm_pt.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/include/linux/hmm_pt.h b/include/linux/hmm_pt.h
index f745d6c..22100a6 100644
--- a/include/linux/hmm_pt.h
+++ b/include/linux/hmm_pt.h
@@ -255,6 +255,16 @@ static inline void hmm_pt_directory_lock(struct hmm_pt *pt,
 		spin_lock(&pt->lock);
 }
 
+static inline spinlock_t *hmm_pt_directory_lock_ptr(struct hmm_pt *pt,
+						    struct page *ptd,
+						    unsigned level)
+{
+	if (level)
+		return &ptd->ptl;
+	else
+		return &pt->lock;
+}
+
 static inline void hmm_pt_directory_unlock(struct hmm_pt *pt,
 					   struct page *ptd,
 					   unsigned level)
@@ -272,6 +282,13 @@ static inline void hmm_pt_directory_lock(struct hmm_pt *pt,
 	spin_lock(&pt->lock);
 }
 
+static inline spinlock_t *hmm_pt_directory_lock_ptr(struct hmm_pt *pt,
+						    struct page *ptd,
+						    unsigned level)
+{
+	return &pt->lock;
+}
+
 static inline void hmm_pt_directory_unlock(struct hmm_pt *pt,
 					   struct page *ptd,
 					   unsigned level)
@@ -358,6 +375,14 @@ static inline void hmm_pt_iter_directory_lock(struct hmm_pt_iter *iter)
 	hmm_pt_directory_lock(pt, iter->ptd[pt->llevel - 1], pt->llevel);
 }
 
+static inline spinlock_t *hmm_pt_iter_directory_lock_ptr(struct hmm_pt_iter *i)
+{
+	struct hmm_pt *pt = i->pt;
+
+	return hmm_pt_directory_lock_ptr(pt, i->ptd[pt->llevel - 1],
+					 pt->llevel);
+}
+
 static inline void hmm_pt_iter_directory_unlock(struct hmm_pt_iter *iter)
 {
 	struct hmm_pt *pt = iter->pt;
-- 
2.4.3